Re: [fuse-devel] buffer size for writing and reading

[Yue Li <yl...@pa...>]

On 2/15/17 5:15 PM, Nikolaus Rath wrote:
> On Feb 12 2017, Yue Li <yli-wUU9E3n5/m56...@pu...> wrote:
>> I noticed that in my testing, the writing size has always been set to
>> 131072 bytes during each write (unless the actual data size is smaller
>> than that), and during the reading, some times it is 131072, but
>> sometimes it can be changed to 65536 and other sizes.
>>
>> I'm wondering are these write and read sizes controlled by user
>> application (in my test i used dd), or it can actually be controlled by
>> FUSE?
> Depends. read() size is controlled by the kernel, unless you use
> direct_io. write() size is controlled by userspace, unless you use
> writeback_cache. Your filesystem can limit the maximum size of requests
> that the kernel will send.
>
Thanks Nikolaus, I prefer to control the sizes be controlled by my 
filesystem, I will try to use the options you mentioned.

Best,

Yue